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I had a new furnace and AC installed by a good installer. It is great other than the fact when running AC their is some noise that is caused by the velocity of the air that sounds like a higher pitched sort of howl. When it runs on heat it is quieter than the old unit (blower is apparently runnning slower. What could be done to lower the noise? Someone suggested using one of those higher density filters (3M,etc) when running on AC.

no argument

No argument - I am not going to mess with it. Just want to be informed. Could that blower assembly be substandard or prone to create that noise or is it more likely an air flow issue? I realize you haven't look at it.